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How to use __set_name__ method in localstack

Best Python code snippet using localstack_python

test_subclassinit.py

Source:test_subclassinit.py

...75        self.assertEqual(Left.calls, [])76        self.assertEqual(Right.calls, [])77    def test_set_name(self):78        class Descriptor:79            def __set_name__(self, owner, name):80                self.owner = owner81                self.name = name82        class A:83            d = Descriptor()84        self.assertEqual(A.d.name, "d")85        self.assertIs(A.d.owner, A)86    def test_set_name_metaclass(self):87        class Meta(type):88            def __new__(cls, name, bases, ns):89                ret = super().__new__(cls, name, bases, ns)90                self.assertEqual(ret.d.name, "d")91                self.assertIs(ret.d.owner, ret)92                return 093        class Descriptor:94            def __set_name__(self, owner, name):95                self.owner = owner96                self.name = name97        class A(metaclass=Meta):98            d = Descriptor()99        self.assertEqual(A, 0)100    def test_set_name_error(self):101        class Descriptor:102            def __set_name__(self, owner, name):103                1/0104        with self.assertRaises(RuntimeError) as cm:105            class NotGoingToWork:106                attr = Descriptor()107        exc = cm.exception108        self.assertRegex(str(exc), r'\bNotGoingToWork\b')109        self.assertRegex(str(exc), r'\battr\b')110        self.assertRegex(str(exc), r'\bDescriptor\b')111        self.assertIsInstance(exc.__cause__, ZeroDivisionError)112    def test_set_name_wrong(self):113        class Descriptor:114            def __set_name__(self):115                pass116        with self.assertRaises(RuntimeError) as cm:117            class NotGoingToWork:118                attr = Descriptor()119        exc = cm.exception120        self.assertRegex(str(exc), r'\bNotGoingToWork\b')121        self.assertRegex(str(exc), r'\battr\b')122        self.assertRegex(str(exc), r'\bDescriptor\b')123        self.assertIsInstance(exc.__cause__, TypeError)124    def test_set_name_lookup(self):125        resolved = []126        class NonDescriptor:127            def __getattr__(self, name):128                resolved.append(name)129        class A:130            d = NonDescriptor()131        self.assertNotIn('__set_name__', resolved,132                         '__set_name__ is looked up in instance dict')133    def test_set_name_init_subclass(self):134        class Descriptor:135            def __set_name__(self, owner, name):136                self.owner = owner137                self.name = name138        class Meta(type):139            def __new__(cls, name, bases, ns):140                self = super().__new__(cls, name, bases, ns)141                self.meta_owner = self.owner142                self.meta_name = self.name143                return self144        class A:145            def __init_subclass__(cls):146                cls.owner = cls.d.owner147                cls.name = cls.d.name148        class B(A, metaclass=Meta):149            d = Descriptor()150        self.assertIs(B.owner, B)151        self.assertEqual(B.name, 'd')152        self.assertIs(B.meta_owner, B)153        self.assertEqual(B.name, 'd')154    def test_set_name_modifying_dict(self):155        notified = []156        class Descriptor:157            def __set_name__(self, owner, name):158                setattr(owner, name + 'x', None)159                notified.append(name)160        class A:161            a = Descriptor()162            b = Descriptor()163            c = Descriptor()164            d = Descriptor()165            e = Descriptor()166        self.assertCountEqual(notified, ['a', 'b', 'c', 'd', 'e'])167    def test_errors(self):168        class MyMeta(type):169            pass170        with self.assertRaises(TypeError):171            class MyClass(metaclass=MyMeta, otherarg=1):...

bulkfood_v4.py

Source:bulkfood_v4.py

...39    # - self - descriptor instance,40    # - owner - the managed class,41    # - name - is the name of the attribute of owner, to which this42    #   descriptor instance was assigned in the class body of owner.43    def __set_name__(self, owner, name):44        # This is what the __init__ did in implementation without __set_name__45        self.storage_name = name46    # Same implementation as in the non-__set_name__ case.47    def __set__(self, instance, value):48        if value > 0:49            instance.__dict__[self.storage_name] = value50        else:51            msg = f'{self.storage_name} must be > 0'52            raise ValueError(msg)53    54    # __get__ isn't needed - the name of the storage attribute matches55    # the name of the managed attribute. There's no risk of a mistake,56    # missuse or malicious intent.57    # def __get__(self, instance, owner):...

main.py

Source:main.py

1from material import Material2from simulator import Simulator3def main():4    iron = Material(0, 1)5    iron.__set_name__("iron")6    iron_bar = Material(0, 15)7    iron_bar.__set_name__("iron-bar_1")8    iron_bar.add_material_to_recipe(iron, 5)9    iron_bar2 = Material(0, 8)10    iron_bar2.__set_name__("iron-bar_2")11    iron_bar2.add_material_to_recipe(iron, 5)12    iron_bolt = Material(0, 10)13    iron_bolt.__set_name__("iron-bolt")14    iron_bolt.add_material_to_recipe(iron_bar, 2)15    copper = Material(0, 2)16    copper.__set_name__("copper")17    copper_bar = Material(0, 8)18    copper_bar.__set_name__("copper-bar")19    copper_bar.add_material_to_recipe(copper, 5)20    plate = Material(0, 30)21    plate.__set_name__("plate")22    plate.add_material_to_recipe(iron_bolt, 1)23    plate.add_material_to_recipe(copper_bar, 3)24    simulator = Simulator(120, [iron, iron_bar, iron_bar2, iron_bolt, copper, copper_bar, plate])25    simulator.simulate()26if __name__ == "__main__":...

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